Abstract
AbstractNbB2‐NbC composite coatings with or without Al2O3 addition had been fabricated via the plasma spraying method, respectively. The effect of nano‐Al2O3 on the microstructure and properties (microhardness, toughness and wear resistance) of sprayed NbB2‐NbC coating was explored. It was found that NbB2‐NbC coating exhibited loose microstructure, many pores and no obvious lamellar structure. NbB2‐NbC‐Al2O3 composite coating showed denser microstructure, fewer pores, and more obvious lamellar structure than NbB2‐NbC composite coating. NbB2‐NbC‐Al2O3 composite coating had high microhardness, good toughness, and excellent wear resistance, which could mainly attribute to the addition of nano‐Al2O3 leading the composite powder to melt more fully.
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